CN104062923B - Space flight multichannel TDICCD camera synchronous method - Google Patents
Space flight multichannel TDICCD camera synchronous method Download PDFInfo
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- CN104062923B CN104062923B CN201410311671.XA CN201410311671A CN104062923B CN 104062923 B CN104062923 B CN 104062923B CN 201410311671 A CN201410311671 A CN 201410311671A CN 104062923 B CN104062923 B CN 104062923B
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Abstract
Space flight multichannel TDICCD camera synchronous method, relates to camera space field of synchronization, solves each camera existing and works alone and can cause that imaging beat is inconsistent, successive image splicing difficulty, the problem of image quality difference.The method is the RXD signal by high frequency clock detection RS422 communication bus, when RXD is become 0 from 1, synchronizing signal Sysc_flag is set to 1, jumps out detection procedure simultaneously and enters synchronizing signal hold mode；When synchronizing signal sysc_flag is become 1 from 0, then clock division enumerator is carried out the operation that resets；When synchronizing signal sysc_flag is become 1 from 0, then driver' s timing enumerator carrying out the operation that resets, the driver' s timing starting each imaging band from same benchmark is completely the same.The present invention is without introducing any hardware circuit, and the signal utilizing existing master backup RS422 communication link to realize between each imaging band synchronizes, and reliability is higher.
Description
Technical field
The present invention relates to camera space simultaneous techniques field, be specifically related to a kind of space flight multichannel TDICCD phase
Machine synchronous method.
Background technology
Along with the raising of camera space resolution, in order to increase the imaging fabric width of camera, typically use multichannel
Joining image-forming, in order to ensure the reliability of imaging system, general each interchannel imaging circuit is separate,
The fault avoiding certain passage causes whole camera to lose efficacy.But, each camera works alone and can cause
Imaging beat is inconsistent, on the one hand can cause the difficulty that successive image splices, and the most easily causes interchannel simultaneously
Imaging crosstalk, cause image quality to decline, so in the case of not increasing additional hardware, it is achieved manifold
Synchronization between road, has important using value.
Summary of the invention
Work alone can cause that imaging beat is inconsistent, successive image splicing is tired to solve each camera existing
Difficult, the problem of image quality difference, the present invention provides a kind of space flight multichannel TDICCD camera synchronous method.
The present invention solves that the technical scheme that technical problem is used is as follows:
Space flight multichannel TDICCD camera synchronous method, the method is realized by following steps:
Step one, synchronizing signal generate
By the RXD signal of imaging system high frequency clock detection RS422 communication bus, when RXD is become by 1
When being 0, then synchronizing signal Sysc_flag is set to 1, jumps out detection procedure simultaneously, enter synchronizing signal and protect
Hold state；
Step 2, communication sampling clock synchronize
When synchronizing signal sysc_flag is become 1 from 0, then by the clock division meter relevant to RS422 communication
Number device carries out the operation that resets, it is ensured that each imaging band follow-up receives camera space master control system control instruction
The decoding moment keeps consistent；
Step 3, TDICCD drive signal to synchronize
When synchronizing signal sysc_flag is become 1 from 0, then when generation TDICCD is driven the driving of signal
Sequence enumerator carries out the operation that resets, and the most all TDICCD drive signal phase from the beginning of same benchmark so that
The driver' s timing of each imaging band is completely the same.
The detailed process of step one is: synchronizing signal and RXD_REG are initialized as 0, drives at dominant frequency clock
Under Dong, RXD is deposited in RXD_REG depositor, form the time delay of a clock cycle, detection
The RXD signal of RS422 communication bus and the value of RXD_REG depositor, when RXD be 0 and
When RXD_REG is 1, represents that RXD trailing edge arrives the moment, then synchronizing signal Sysc_flag be set to 1,
Jump out detection procedure simultaneously, enter synchronizing signal hold mode.
Further comprising the steps of: the protection of synchronizing signal: by triplication redundancy, prevent the single-particle time from causing
Synchronizing signal reversion causes exceptional reset, RS422 communication is only carried out a synchronizing signal and produces operation, complete
After becoming synchronizing signal to produce operation, state then jumps to, in a protection state machine, no longer carry out synchronous detecting.
The invention has the beneficial effects as follows:
The present invention uses existing communication link between camera space master control system and imaging band, utilizes system high
Frequently RS422 signal of communication is judged by clock, when first trailing edge arrives, then synchronizing signal is put
It is 1, owing to the start bit of RS422 communication is " 0 ", so after system electrification has initialized, if boat
It camera master control system sends any one instruction to any one imaging band, then occupy bus slave computer status
All imaging bands all can be simultaneously received this start bit, it is determined that and generate to enter for each imaging band
The signal that row synchronizes, in the synchronizing signal effective moment to the clock division enumerator of each imaging band, drive
Dynamic sequential counter etc. carries out the operation that resets, and is equal to an outside Global reset, it is achieved multichannel TDICCD
The synchronization of camera work.
The present invention, without introducing any hardware circuit, utilizes existing master backup RS422 communication link, so that it may
To realize the signal synchronization between each imaging band, reliability is higher, has important engineer applied and is worth.This
Invention is particularly well-suited to inter-channel synchronization is required much higher passage TDICCD camera.
Accompanying drawing explanation
Fig. 1 is that camera space master control system communicates to connect schematic diagram with imaging band.
Fig. 2 is synchronizing signal product process figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As it is shown in figure 1, the space flight multichannel TDICCD camera synchronous method of the present invention, do not increasing hardware
In the case of circuit, utilize existing RS422 one-to-many communication bus, to space flight multichannel TDICCD phase
Machine imaging system (imaging band 1, imaging band 2, imaging band 3, imaging band 4) carries out synchronizing behaviour
Making, the method is realized by following steps:
Step one, synchronizing signal generate: as in figure 2 it is shown, after system electrification initializes, by synchronizing signal and
RXD_REG is initialized as 0, under dominant frequency clock drives, RXD deposits RXD_REG depositor
In, form the time delay of a clock cycle, the RXD signal of detection RS422 communication bus and RXD_REG
The value of depositor, when RXD be 0 and RXD_REG be 1 time, represent RXD trailing edge arrive the moment,
Then synchronizing signal (Sysc_flag) is set to 1, jumps out detection procedure simultaneously, enter synchronizing signal hold mode,
Repeated detection is avoided normally to work with repeatedly synchronous impact imaging system.
Step 2, communication sampling clock synchronize: when synchronizing signal (sysc_flag) is become 1 from 0, then will
The clock division enumerator relevant to RS422 communication carries out the operation that resets, it is ensured that each imaging band follow-up connects
The decoding moment receiving camera space master control system control instruction keeps consistent.
Before communicating sampling clock simultaneously operating, the maximum phase error of communication sampling clock can reach
The time of one transmission bit, as a example by the transfer rate of 38400bps, maximum phase error can reach 26 μ s,
For high-resolution camera, its with row transfer time already at same magnitude, can affect image quality with
And the splicing precision of later stage ground image.
Step 3, TDICCD drive signal to synchronize: when synchronizing signal (sysc_flag) is become 1 from 0,
Then the driver' s timing enumerator of signal is driven to carry out the operation that resets, the most all TDICCD by producing TDICCD
Drive signal phase from the beginning of same benchmark so that the driver' s timing of each imaging band is completely the same.
Before carrying out TDICCD driving signal simultaneously operating, the driving camera of each imaging band is random
, depend on that the difference of fpga chip initialization time, maximum phase difference can reach 1 row transfer week
Phase, high-resolution camera or the image quality of mapping camera and ground image splicing there is considerable influence.
Step 4, the protection of synchronizing signal: owing to the rising edge of synchronous reset signal can cause system core meter
Number device resets, so needing to protect it, prevents space single-particle from causing abnormal operation；Pass through
Triplication redundancy, prevents the single-particle time from causing synchronizing signal reversion to cause exceptional reset, simultaneously in order to avoid many
Subsynchronous operation affects the normal work of imaging system, RS422 communication is only carried out a synchronizing signal and produces
Operation, after completing synchronizing signal generation operation, state then jumps to, in a protection state machine, no longer carry out
Synchronous detecting.
Claims (1)
1. space flight multichannel TDI CCD camera synchronous method, it is characterised in that the method is by following steps
Realize:
Step one, synchronizing signal generate
By the RXD signal of imaging system high frequency clock detection RS422 communication bus, when RXD is become by 1
When being 0, then synchronizing signal Sysc_flag is set to 1, jumps out detection procedure simultaneously, enter synchronizing signal and protect
Hold state；
Step 2, communication sampling clock synchronize
When synchronizing signal sysc_flag is become 1 from 0, then by the clock division meter relevant to RS422 communication
Number device carries out the operation that resets, it is ensured that each imaging band follow-up receives camera space master control system control instruction
The decoding moment keeps consistent；
Step 3, TDI CCD drive signal to synchronize
When synchronizing signal sysc_flag is become 1 from 0, then when generation TDI CCD is driven the driving of signal
Sequence enumerator carries out the operation that resets, and the most all TDI CCD drive signal phase from the beginning of same benchmark so that
The driver' s timing of each imaging band is completely the same；
The detailed process of step one is: synchronizing signal and RXD_REG are initialized as 0, drives at dominant frequency clock
Under Dong, RXD is deposited in RXD_REG depositor, form the time delay of a clock cycle, detection
The RXD signal of RS422 communication bus and the value of RXD_REG depositor, when RXD be 0 and
When RXD_REG is 1, represents that RXD trailing edge arrives the moment, then synchronizing signal Sysc_flag be set to 1,
Jump out detection procedure simultaneously, enter synchronizing signal hold mode；
Further comprising the steps of: the protection of synchronizing signal: by triplication redundancy, prevent the single-particle time from causing
Synchronizing signal reversion causes exceptional reset, RS422 communication is only carried out a synchronizing signal and produces operation, complete
After becoming synchronizing signal to produce operation, state then jumps to, in a protection state machine, no longer carry out synchronous detecting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410311671.XA CN104062923B (en) | 2014-07-01 | 2014-07-01 | Space flight multichannel TDICCD camera synchronous method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410311671.XA CN104062923B (en) | 2014-07-01 | 2014-07-01 | Space flight multichannel TDICCD camera synchronous method |
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| CN104062923A CN104062923A (en) | 2014-09-24 |
| CN104062923B true CN104062923B (en) | 2016-11-02 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104378548B (en) * | 2014-10-31 | 2017-10-24 | 北京空间机电研究所 | A kind of space multi-spectral imaging instrument video circuit system |
| CN108881718B (en) * | 2018-06-22 | 2021-05-04 | 中国科学院长春光学精密机械与物理研究所 | Synchronous control method of multi-group TDI CMOS imaging system |
| CN112104811B (en) * | 2020-09-21 | 2021-06-29 | 中国科学院长春光学精密机械与物理研究所 | Low-latency multi-group imaging control system |
| CN112653852B (en) * | 2020-12-14 | 2022-04-15 | 长光卫星技术股份有限公司 | System and method for avoiding TDI CCD (time delay integration charge coupled device) spectrum crosstalk in high-density circuit |
| CN117294822B (en) * | 2023-11-27 | 2024-03-01 | 齐鲁空天信息研究院 | Optical remote sensing satellite data processing method, device, equipment and storage medium |
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